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In context of sysctl.conf settings, what is the difference between (all vs. default) like net.ipv4.conf.all.accept_source_route & net.ipv4.conf.default.accept_source_route in sysctl settings ?

If I added all values, is it necessary to add default as well ?

Using Ubuntu 12.04 LTS

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all is for all routes, while default is only for default route.

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